Petroleum Quality Institute of America

The Petroleum Quality Institute of America (PQIA) is an independent resource for information and insights on the quality and performance of lubricants in the marketplace.  Our mission is to serve the consumer of lubricants by reporting on the quality and integrity of lubricants in the marketplace.





Kendall GT-1 5W-30 (December 2009)-a (Note: Kendall changed its additive package in 2010 to include a titanium additive, not shown in this sample)




PHYSICAL TESTS Standard/ranges-b Average-e Kendall GT-1 5W-30
 TBN, mg KOH/g, (ASTM D2896) 7.4 to 9.0 8.0 7.6
 Viscosity @ 100ºC, cSt, (ASTM D445) 9.3 to 12.5 10.39 10.68
 Viscosity @ 40ºC, cSt, ASTM D445 55.0 to 82.0 60.48 63.75
 Viscosity Index (ASTM D2270) 156 to 167 163 160
 Viscosity @ -30ºC mPa s (cP) (ASTM D5293) 6,600 Max 5,793 5,950
 Volatility, mass % loss, 1 hr, @ 250ºC (ASTM D5800) 15 Max 13.5 13.9
    Nitrogen μg/g (ASTM D-5762) 720 to 1,000 860 1,000
    Calcium  1,648 to 2,301 2,043 2,042
    Magnesium, ppm  6 to 43 11 8
    Phosphorus,  ppm 600 to 800 772 772
    Zinc, ppm  789 to 887 851 850
    Molybdenum,  ppm  <1 to 226 93 40
    Barium, ppm  <1 <1 <1
Additive and/or other
    Boron,  ppm  <1 to 246 84 251
    Silicon,  ppm-d  4 to 8 5 4
    Potassium, ppm  <1  <1 <1
    Manganese, ppm  <1 to 8 1 <1
    Titanium, ppm  <1 <1 <1
    Sulfur, ppm  5,000 max 3,021 3,935
    Copper, ppm  <1  <1 <1
    Sodium, ppm  <1 to 467 82 <1
    Vanadium, ppm  <1 <1 <1
    Silver, ppm  <1 <1 <1
    Aluminum, ppm  <1 to 2 <1 <1
    Chromium, ppm  <1 <1 <1
    Iron, ppm  <1 to 1 1 1
    Nickel, ppm  <1 <1 <1
    Lead, ppm  <1 to 1 <1 <1
    Antimony, ppm  <1 <1 <1
    Tin, ppm  4 to 5 5 5

a- Click here for product label.

b- Standards, shown in orange, are established by API, SAE and others. Ranges, shown in teal, represent the high and low data for the majors shown.

c-Test Method for metal analysis is ASTM ASTM D5185.

d- Although silicon is used as an antifoam additive in lubricants, concentrations above 7ppm have been linked to contamination from abrasive material,

e- Average of the 10 major brands tested. Click here for brands tested.

Kendall GT-1 5W-30 (December 2009)
The American Petroleum Institute sets forth a number of laboratory and engine tests required to meet an API SM performance specification. Although laboratory tests alone cannot be used to establish if an engine oil meets API SM, they can be used to determine if it doesn't.

What follows is a comparison of the test results for Kendall GT-1 5W-30 as compared to the API SM requirements.

The API limits for each test are shown by the yellow bars. The test result for Kendall GT-1 5W-30 are illustrated by the horizontal line.

The viscometrics of Kendall GT-15W-30 meets the required targets for a 5W-30 API SM (SAE J300 specification).

Volatility Phosphorus
The volatility of Kendall GT-15W-30 is within the parameters required for an API SM GF-4 designation.


The phosphorus content in Kendall GT-15W-30 is within the parameters required for an API SM GF-4 designation.




Click here for Kendall info on its 5W-30 Note: This link takes users outside of the Petroleum Quality Institute of America website. PQIA is not responsible for the content shown at the link, nor does it endorse or otherwise represent the product statements shown at the ConocoPhillip/Kendall website or associated links.